body {
  font-family: Clear Sans,Helvetica Neue,Arial,sans-serif;
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
  padding: 16px;
  padding-top: 0;
}
header {
  border-bottom: 1px solid #ccc;
  margin-bottom: 30px;
  position: relative;
}
h1 {
  font-size: 36px;
  margin: 4px 0;
}
.operations {
  position:absolute;
  left: 0;
  right:0;
  bottom:4px;
  display: flex;
  justify-content: space-between;
}

a {
  color: #909399;
  text-decoration: none;
  cursor: pointer;
}
a:hover {
  color: #a6a9ad;
}
a + a {
  margin-left: 16px;
}

.correct, .present, .absent {
  color: #fff!important;
}
.correct {
  background: #6aaa64!important;
}
.present {
  background: #c9b458!important;
}
.absent {
  background: #787c7e!important;
}

.tips {
  font-size: 14px;
  color: #cdcdcd;
}